buildroot

package/efl: add Wayland support

The EFL Wayland support was removed with commit [1] since the dependecy
on libdrm was missing. Also it requires OpenGL ES with EGL, Evas DRM
and Evas GLES DRM support [2].

As stated in configure, Evas GLES DRM engine support (gl_drm) depends
on wayland-client to build (wayland-client >= 1.8.0).

So, enable gl_drm only when wayland support is selected.

[1] 4f04be1659f186765f506c68f5bfbf6845fc40dc
[2] https://www.enlightenment.org/about-wayland

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Pierre Floury <devpfl@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>